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1·She could not move unassisted.

她不能够独力活动。《牛津词典》

2·His contribution could be key.

他的贡献可能是最重要的。《牛津词典》

3·He could easily vault the wall.

他可以轻而易举地跃过这堵墙。《柯林斯英汉双解大词典》

4·We could anchor off the pier.

我们可以在码头抛锚。《柯林斯英汉双解大词典》

5·Could you go a little slower?

你能走慢点吗？《牛津词典》

6·Could I have your autograph?

我能请你签个名吗？《牛津词典》

7·She could feel herself blushing.

她可以感到脸都红了。《牛津词典》

8·I'm sorry—could you repeat that?

对不起—你可以再说一遍吗？《牛津词典》

9·Could we meet at lunchtime?

我们能在午餐时间见个面吗？《柯林斯英汉双解大词典》

10·You could have been killed!

你本可能被杀了。《柯林斯英汉双解大词典》

可以

1·He could whip a crowd into hysteria.

他可以怂恿一群人，使他们变得歇斯底里。《柯林斯英汉双解大词典》

2·He could easily vault the wall.

他可以轻而易举地跃过这堵墙。《柯林斯英汉双解大词典》

3·I'm sorry—could you repeat that?

对不起—你可以再说一遍吗？《牛津词典》

4·We could anchor off the pier.

我们可以在码头抛锚。《柯林斯英汉双解大词典》

5·I thought we could go out tonight.

我本想我们今晚可以出去。《牛津词典》

能

1·He could hear the beat of his heart.

他能听到自己的心跳。《柯林斯英汉双解大词典》

2·I could hear the soup bubbling away.

我能听到汤在咕嘟咕嘟地响。《牛津词典》

3·I was delighted that you could stay.

你能留下来我很高兴。《牛津词典》

4·He could always smell out fear.

别人有什么恐惧，他总能觉察到。《牛津词典》

5·I'd be glad if you could help me.

你若能帮助我，我会非常感激。《牛津词典》

可能

1·His contribution could be key.

他的贡献可能是最重要的。《牛津词典》

2·The consequences could be serious.

后果可能是严重的。《牛津词典》

3·The volcano could erupt at any time.

这座火山随时可能爆发。《牛津词典》

4·This could be the man of my dreams.

这可能是我理想的男人。《柯林斯英汉双解大词典》

5·You could be prosecuted for trespass.

你可能会因擅自闯入而被起诉。《柯林斯英汉双解大词典》

能够

1·She could not move unassisted.

她不能够独力活动。《牛津词典》

2·I could hear the sound of his ragged breathing.

我能够听到他那急促的呼吸声。《牛津词典》

3·Katy could think clearly when not under stress.

凯泰在没有精神压力时能够清晰地思考。《柯林斯英汉双解大词典》

4·We could hear sounds of revelry from next door.

我们能够听到隔壁纵饮狂欢的声音。《牛津词典》

5·Only one witness could make a positive identification.

只有一位目击者能够明确指认。《牛津词典》

(1)could be可能是；有可能

(1)could have本能够；本来也可以

(1)how could i我怎么能；我如何能够

(1)could have done本来能做成的（却没做成）

(1)nobody could没人能做到；那么别人也休想

(1)could not help禁不住，忍不住